Rock-drill.



- 1). T. FISHER.

BOOK DRILL.

APPLICATION FILED JULY 1, 1909.

Patented Apr. 14, 1914.

2 8HEETS-SHEBT 1.

COLUMBIA FLANOGRAPH co.. WASHINGTON, b. c-.

D. T. FISHER.

ROCK DRILL.

APPLICATION FILED JULY 1, 1909.

1,093,120. Patented Apr. 14, 1914.

. v 2 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH 60., WASHINGTON, D. c.

DUDLEY T. FISHER, OF COLUMBUS, OHIO, ASSIGNOR TO THE JEFFREY MANUFAG- TUBING COMPANY, A CORPORATION OF OHIO.

ROCK-DRILL.

Specification of Letters Patent.

Patented Apr. 1d, 191 i.

Application filed July 1, 1909. Serial N 0. 505,403.

To all whom it may concern Be it known that I, DUDLEY T. FISHER, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Rock-Drills, of;which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in drills for rock and similar materials of the type in which the cutting tool is vibrated by being struck by a reciprocating hammer.

The drill is primarily intended to be operated by hand, but it will be apparent that it may be used with any other suitable motive power. p y

The objects of the invention are to provide a drill of the type described having improved means for actuating the hammer, and improved means for holding and feeding the cutting tool.

Other objects relate to the various details of construction and arrangement of parts set forth in the following specification.

Of the drawings Figure 1 is a perspective view showing the complete drill in operative position. Fig. 2 is a cross sectional view through the center line of the operatlng mechanism. Fig. 3 is a plan view. Fig. 1 is an end elevation. Fig. 5 is a fragmentary cross sectional View showing an alternate form of elastic mounting for the hammer. Fig. 6 is a detailed view showing the supporting latch.

Referring to the drawing, 1 is the main frame of the machine and is adjustably supported on the tripod 2 which may be of any preferred construction. By adjusting the bolt 3, theframe 1 may be placed at any desired position. In this way it is possible to drill a hole which shall be vertical, horizontal, or at any other desired angle.

4 representsthe main carriage of the drill and is slidably mounted on the frame 1 by means of the dovetailed guide-way 5. The shaft 6 is mounted horizontally in suitable bearings on the carriage 1 and is provided at each end with cranks 7. At one end of the shaft is provided the gear wheel 8 which wheel meshes with the pinion gear 30 which meshes with meshes with the pinion 9 on the cranked shaft 10 which is mounted in bearings on the carriage 4.

11 is a cross head or yoke which is slidably mounted on the rods 12 which extend parallel to the guide-way 5 from suitable supporting brackets on the carriage 4. The

rod or pitman 13 is pivotally connected at one end to the central part of the cross head 11 and is mounted at the other end on the cranked portion of the shaft 10.

14: is a fiat band or ribbon of elastic material, preferably leather, and is connected at each end to the cross head 11 by means of the clamps 15. These clamps are so formed that as they are tightened up by means of the bolts, the extensions 16 will force the band 14 into the slots of the cross head, thus placing the band under tension.

17 is the hammer and is slidably mounted in the forward part of the carriage 4. The rear part of the hammer is provided with a cross piece and is clamped to the band 14 by means of the bar 18 and the nuts 19. The sleeve 20 is slidably and rotatably mounted on the forward extending cylindrical portion 21 of the carriage i, and is concentric with the hammer 17. At the forward end of the sleeve 20 is the cutting tool 22 which is secured in place by means of the set screw 23. The projection 21 is provided with an enlarged central aperture in which is located the coiled spring '24:. This spring engages with the part 21 and the sleeve 20 and tends to thrust the sleeve forward at all times. The clip 25 on the carriage 4: engages with the flange 26 and limits the forward movement of the sleeve.

27 is a gear wheel either cast integrally with the sleeve, as shown in the drawings, or otherwise suitably attached. This gear 28 on the shaft 29 which is mounted in suitable bearings on the carriage 4. The other end of the shaft 29 is provided with the beveled a similar gear 31 on the driving shaft 6.

82 is the feed screw which engages the boss 33 on the main frame 1. At the lower end of the feed screw is rotatably attached the nut or washer 34 which is held in place by means of the cotter pin 35. The coiled spring 36 is secured to the washer 34: and is arranged to enter the socket 37 of the carriage 4.

38 is a latch which is pivotally connected to the carriage 4 at 39 and may be thrown into or out of operative position at the will of the operator. When in operative position, as shown in Fig. 6, it is held in position by the lug 40 and engages the washer 34, thus serving to support the carriage and operating mechanism.

In Fig. 5 I have shown an alternate form for the connection between the hammer 17 and the cross head 11. This consists in a flat bar 14: of spring steel which is clamped at its center to the hammer, and at its ends is secured to the cross head by means of the clamps 15. These clamps are of the same construction as those used with the leather straps l4 and are made suitable for either purpose. by providing two holes for the clamping bolts.

The operation of the drill is as follows. The cutting tool 22 is placed in position in the sleeve 20 and is adjusted so that with the spring 24 compressed, as shown in Fig. 2, and with the hammer in its forward position, the rear end of the cutting tool and the forward end of the hammer will be in light contact. The positions of the frame and carriage are adjusted so that the cutting tool is brought into proper position for drilling. The latch 38 is thrown out of operative position, and the machine started by means of the cranks 7. By means of the gears 8 and 9, the shaft 10 and the pitman 13, the cross head 11 is given a rapid reciprocating motion and carries with it the hammer 17. The elastic connection between the hammer and the cross head permits the hammer to strike a sharp blow on the cutting tool without in any way cramping the shaft 10, or placing an undue strain on its bearings. The cutting tool is continuously rotated by means of the train of gearing which connect it to the main driving shaft. In this way the cutting tool is given a combined vibratory and rotary motion, thus obtaining a very efficient drilling action. If for any reason, the carriage ceases to move forward during the drilling operation, the spring 24 acts to thrust the cutting tool forward relative to the carriage and out of range of the motion of the hammer. This not only serves to save wear on the faces of the hammer and cutting tool, but also serves to give warning to the operator that the machine is not feeding properly. If the'h'ole to be drilled is substantially a vertical one, the weight of the carriage and the operating mechanism will, in many cases, be found suflicient to feed the drill without using the feed screw 32. With the latch'38thrown back, the carriage may move forward freely,

disengaging itself from the spring 36. If

it is found that the weight of the carriage and mechanism is not suificient for feeding, the feeding force may be augmented at any time by the use of the feed screw. In drilling a horizontal hole, it will be necessary, of course, to depend entirely upon the screw for feeding. The latch 38 may be used for withdrawing the cutting tool from the drilled hole for adjusting the carriage to a proper working position and for supporting the carriage while the cutting tool is being adjusted or replaced.

What I claim is V 1. In a drill, a carriage havinga hollow cylindrical portion, 7 a hammer slidably mounted internally in the said cylindrical portion, means for reciprocating the hammer, a sleeve slidably mounted externally on the said portion, a cutting tool mounted in the sleeve in position to be struck by the reciprocating hammer, and a spring in the hollow cylindrical portion adapted to engage the sleeve and hold the cutting tool put of range of the hammer, substantially as set forth.

2. In a drill, a carriage having a hollow cylindrical portion, av hammer, slidably mounted internally in the said cylindrical portion, means for reciprocating the hammer, a sleeve slidably mounted externally on the cylindrical portion, a cutting tool mounted in the sleeve in position to bestruck by the reciprocating hammer, a spring in the hollow cylindrical portion adapted to' engage the sleeve and hold the cutting tool out of range of the hammer, and means limiting the motion of the sleeve.

3. In a drill,'the combination of a relatively stationary and hollow cylindrical member, two reciprocable alined elements one of which is slidable internally in the said member, a guiding and supporting sleeve connected to the other element and axially slidable externally on the said member, and means for reciprocating one of the elements to strike it against the other,substantially as set forth.

4. In a drill, a carriage having a hollow cylindrical portion, a hammer slidably mounted internally in the said cylindrical portion, means for reciprocating the hammer, a guiding and supporting sleeve slidably and rotatably mounted externally on the said cylindrical portion, a cutting tool secured in the sleeve in a position to be struck by the reciprocating hammer, and

means for rotating the sleeve and cutting tool, substantially as set forth.

5. In a drill, a carriage having a hollow cylindrical portion, a hammer slidably mounted internally in the said cylindrical 1,093,120 &

portion, means for reciprocating the ham- In testimony whereof I affix my signature, mer, a guiding and supporting sleeve slidin presence of two Witnesses. ably mounted externally on the said cylindrical portion, a cutting tool mounted in the DUDLEY FISHER 5 sleeve in a position to be struck by the said Witnesses:

reciprocating hammer, and means for lim- E. L. HOPKINS,

iting the motion of the sleeve. 0. P. SNIVELY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. 0. 

